Grinder for leather-shaving machines.



No; 802,889. PATENTED 001'. 24, 1905. J. 001).

GRINDER FOR LEATHER SHAVING MACHINES.

APPLIOATION FILED APR. 7, 1904.

witnesses: 7 [7111881 67 V WWI/4W (QMLM TM (fl Wm UNITED STA ES PATENT OFFIGE.

'JOHN Roon. ORlbA vERS, MASSACHUsETTS, ASSIGNOR, BY MESNE AS- sioNMENTs' ro TURNER TANNING MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION.

GRINDER FOR LEATHER-SHAVING MACHINES.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed April 7, 1904. Serial No. 202,084.

, To all, whom, it petty concern:

Be it known that I, JOHN R001), a citizen of the United States, residing at Danvers, in the county of Essex, State of Massachusetts, have invented a certain new and useful Improvement in Grinders for Leather-Shaving Machines, of which the following is a specification, reference being bad therein to the accompanying drawings.

In machines which are employed for shaving leather the Spiral knives which do the shaving require constant sharpening. To accomplish this result, it is customary to have a traveling grinding-roll which engages the surface of the spiral knives during the operation of the machine. This grinding-roll is caused to travel slowly back and forth lengthwise of the shaving-roll, thus keeping the edges of these knives constantly sharp. Heretofore it has been customary to move the grinding-roll backward and forward by means of a lever pivoted at its lower end to the frame of the machine and operated in some convenient manner. This form gives the grinding-roll a substantially harmonic'motion, thus causing it to grind for a longer time upon the ends of the shaving-roll than at the center.

My invention has for its object to provide a mechanism by means of which the grindingroll may be given a uniform rate of speed throughout its entire longitudinal movement along the surface of the shaving-roll.

I have illustrated my invention as applied to a shaving-machine of the ordinary character and in the drawings have shown such parts of the said shaving-machine as are necessary for the understanding of my invention.

My invention is fully set forth in the following description, taken in connection with the accompanying drawings, and the novel features thereof are pointed out and clearly defined in the claims at the close of this Specification.

In the drawings, Figure 1 is a top view of a machine embodying my invention. Fig. 2 is a section on lineAA looking in the direction of the arrows.

Referring to the drawings, 1 is a feed-roll upon which the leather to be shaved is Supported during the operation, and 2 is the shaving-roll, which is composed of a series of spiral blades 3. The said shaving-roll 2 is carried in suitable bearings 1 in the frame 5 and is rotated by any well-known means not necessary to be shown.

The construction of the shaving-knife and feed-roll is old and forms no part of my invention.

Back of the feed-roll 2 and in engagement with its surface is a grindingroll 6, composed of emery or other suitable abrading'material. This grinding-roll 6 is mounted upon a sleeve 7, which in turn is fast upon an arbor 8, carried in bearings 9 on the frame 5 of the machine. The arbor 8 and the parts mounted thereon are free to slide longitudinally of the said arbor in the bearings 9 in order that the grinding-roll may travel to and fro in Contact with the knives of the shaving-roll 2. Upon the said sleeve 7 is also mounted a pulley 10, upon which runs a belt 11. This belt 11 is driven from a pulley 121, which is of a width substantially equal to the entire width between the two frames 5 5 of the machine, said pulley 121 being in turn driven by a belt from any convenient source of power. The relative sizes of the pulleys 121 and lOare determined according to the speed which it is desired to give the grinding-roll. As the grind ing-roll 6 is caused to travel longitudinally of the arbor 8, the belt 11 is pulled along with it by means of the pulley 10, which has at its edges two annular ribs 12 12, which prevent the belt 11 from running off the pulley 10.

To cause the grinding-roll 6 to travel lengthwise of the shaving-roll 2, I provide the following means: On the other side of the pulley 10 of the grinding-roll 6 I provide the sleeve 7 with two ribs 13 13, thus forming a collar for the reception of the two prongs 1 1 of a fork 15. This fork 15, which is clearly shown in Fig. 2, is supported on a rod 16, which passes through the frames on each side of the machine. This rod 16 is also free to slide back and forth in the frames in the same way as has already been described in connection with the arbor 8. The fork 15 is mounted loosely upon this rod so that it may slide backward and forward, as desired. For convenience I also mount a dust-guard 17 on this fork 15 to prevent bits from the grinding-roll flying and doing injury to the work or to the operator. This dust-guard also prevents grit getting into the grooved screw, to be now described.

Below the rod 16 and engaging the lower the surface of a roll 20.

end of the fork 15 I place a forked traveler 18, adapted to engage a spiral groove 19 in The forked traveler 18 is provided with a stem 21, which is received within a hole tapped in the lower end of the fork 15, thus permitting the fork 18 to swivel about its vertical axis. The roll 20 is provided with a continuous right and left hand spiral groove 19 for the reception of the traveler 18. By the rotation of the roll 20 the forked traveler 18 is caused to travel in the groove 19 to the end of the roll 20, when it then returns in the other groove to the other end of the roll, thus giving to the traveler 18 and attached parts a continuous movement lengthwise of the roll 20, said movement being of constant velocity. The grooved roll 20 is provided at one end with a pulley 211, driven by a belt 22 from another pulley 23, fast to a shaft 24 on the frame 5 of the machine. On this shaft is another pulley 25, driven by a belt 26 from a source of power not necessary to be shown. The pulley 211 on the driving-roll 20 is larger than its driving-pulley 23, and the pulley 25 is also larger than its driving-pulley, thereby forming a reducing-gear by means of which the grooved roll 20 is caused to rotate very slowly, thus making the movement of the grinding-roll 6 lengthwise of the shaving-roll 2 comparatively slow. By this means a grinder is provided the grinding-roll of which is caused to travel lengthwise of the shaving-roll with a constant speed, thereby doing away with the uneven grinding resulting from allowing the grinding-roll to remain longer at the ends of its path of movement than in the middle.

While I have shown my invention as em bodied in certain mechanical elements which I have described, it is obvious that modifications may be made. all within the spirit of my invention. and therefore I do not desire to limit myself to the particular arrangement or combination of elements shown herein.

What I claim is- 1. A leather-shaving machine having a shaving-roll, a grinding-roll, a shaft upon which said grinding-roll is fixedly mounted, bearings in which said shaft is both rotatable and axiallymovable, a slide-rod parallel with said grinding-roll shaft and having bearings in which it is slidable, a fork mounted on said slide rod and having fingers which engage with an annular groove on said grinder-shaft, a non-slidable rotary shaft parallel with said slide-rod and provided with a right and left handed screw, a second fork having a connection with said first fork and having fingers which engage with the grooves in said screw and means for rotating said shavingroll, grinding-roll and screw.

2. A leather-shavlng machme having a shaving roll, a grinding-roll, a shaft upon which said grinding-roll is fixedly mounted, bearings in which said shaft is both rotatable and axially movable, a slide-rod parallel with said grinding-roll shaft and having bearings in which it is slidable, a fork mounted on said slide-rod and having fingers which engage with an annular groove on said grinder-shaft, a non-slidable rotary shaft parallel with said slide-rod and provided with a right and left handed screw, a second fork having a swivel connection with said first fork and having fingers which enga e with the grooves in said screw and means or rotating said shavingroll, grinding roll and screw.

3. A leather shaving machine having a shaving-roll, a rinding -roll, a shaft upon which said grin ing-roll is fixedly mounted, bearings in which said shaft is both rotatable and axially movable, a slide-rod parallel with said grinding-roll shaft and having bearings in which it is slidable,an arm loosely mounted on said slide-rod and engaging with said grinder-shaft by a loose connection which causes coincident sliding movement, a nonslidable, rotary shaft provided with a right and left handed screw, and a traveler which engages with the grooves in said screw and is connected with said arm on the slide-rod, and means for rotating said shaving-roll, grinding-roll and screw.

4. A leather-shaving machine having a shavingroll, a grindingroll, a shaft upon which said grinding-roll is fixedly mounted, hearings in which said shaft is both rotatable and axially movable, a slide-rod parallel with said grinding-roll shaft and having hearings in which it is slidable, an arm loosely mounted on said slide-rod and engaging with said grinder-shaft by a loose connection which causes coincident shding movement, a nonslidable, rotary shaft provided with a right and left handed screw, and a traveler which engages with the grooves in said screw and is connected with said arm on the slide rod, and means for rotating said shaving-roll, grindingroll and screw, a driving-pulley parallel with the shaft on which the grinding roll is mounted and of a length equal to the axial length of travel of the grinder-shaft, a driving belt connecting said pulley and said grinder-shaft, and means for preventing the belt from sliding on said grinder-shaft, the belt being left free to slide on said pulley in accord with the sliding of the grinder-shaft.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN ROOD.

IVitnesses:

WM. A. MAoLEon, ALIGE H. MORRISON. 

